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What is Average Reading Ac Voltmeters?

Normally ac voltmeters are average responding type and the meter is calibrated in terms of the rms values for a sine wave. Since most of the voltage measurements involve sinusoidal waveform so this method of measuring rms value of ac voltages works satisfactorily and is less expensive than true rms responding voltmeters. However, in case of measurement of non-sinusoidal waveform voltage, tis meter will give high or low reading depending on the form factor of the waveform of the voltage to be measured.

Main advantages associated with these voltmeters are that they are simple in construction, have high input impedance, low power consumption and uniform scale.

Main disadvantage of these voltmeters is that these operate in audio-frequency range. In radio-frequency range, distributed capacitance of the high resistance R introduces error in the readings. Another disadvantage of such a voltmeter is that due to non-linear voltage-ampere characteristic for lower voltage the readings of the voltmeter at lower voltage are not correct.

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